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In some remarks on a paper of Dr. John Davy’s, entitled “Notice on the Remains of the recent Volcano in the Mediterranean,” which were inserted in the last Part of our Transactions, I expressed my regret, that no accurate statement of the quantity of gas evolved in a given time from any thermal waters had been published, and intimated my intention to make this the subject of special examination, whenever suitable opportunities should occur. Accordingly, having in my former visits to Bath been struck with the copious evolution of gas from the centre of the principal of the hot springs of that city, I solicited from the gentlemen composing the Committee appointed to manage and regulate them, leave to institute such experiments as appeared to me desirable on the spot; and having obtained from them the requisite facilities for so doing, I determined to collect and measure the gas evolved, repeatedly, during a period sufficiently extended to enable me to fix with tolerable precision its average amount, and to ascertain, whether any greater diurnal variation in its quantity could be detected, than what might be fairly set down to errors of manipulation, or to oscillations in the quantities discharged extending over a wider range of time, than that during which it might be found convenient to protract the period of each observation.

I. On the quantity and quality of the gases disengaged from the thermal spring which supplies the King's Bath in the City of Bath